No they are not locking but they do have a zero stop.

Yep!! On my Savage model 10 with a 20moa base in an Oryx Chassis I I had to use medium rings. The low rings caused the scope turret housing to hit the rail. I could get it to clear but it was less than a business card thickness clearance and close to a sheet of paper thickness. IMO with recoil and flex that was going to cause a potential problem. The other issue is the bell clearing when trying to adjust the scope for proper eye relief. With the proper cheek rest and getting an accurate height over bore measurement you will be fine. Hope this helps.

On my Savage model 10 with a 20moa base in an Oryx Chassis I I had to use medium rings. The low rings caused the scope turret housing to hit the rail. I could get it to clear but it was less than a business card thickness clearance and close to a sheet of paper thickness. IMO with recoil and flex that was going to cause a potential problem. The other issue is the bell clearing when trying to adjust the scope for proper eye relief. With the proper cheek rest and getting an accurate height over bore measurement you will be fine. Hope this helps.